A tubular skylight loses less heat than a traditional big skylight and is easier to install. It does penetrate the attic insulation envelope, but installing one can reduce your light costs. It is not uncommon for people to see better under natural light and natural light creates a nicer ambience indoors than switching on lamps.

The amount of light that comes in from a small tubular skylight is quite amazing. For example, a user installed a 10-inch diameter one in the garage. He can easily work on his car in there without any additional electric lights on. If there is a full moon at night, enough light comes through it so he can walk safely in there.

To get a rough idea of how much light output there is from a tubular skylight, figure on the equivalent brightness of three 100-watt incandescent light bulbs from a 10-inch diameter tube. A 14-inch diameter one provides about twice as much light.

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https://www.dailyherald.com/entlife/20210605/tubular-skylights-are-an-alternative-for-natural-light